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1 | ///////////////////////////////////////////////////////////////////////////// | |
2 | // Name: src/msw/thread.cpp | |
3 | // Purpose: wxThread Implementation | |
4 | // Author: Original from Wolfram Gloger/Guilhem Lavaux | |
5 | // Modified by: Vadim Zeitlin to make it work :-) | |
6 | // Created: 04/22/98 | |
7 | // RCS-ID: $Id$ | |
8 | // Copyright: (c) Wolfram Gloger (1996, 1997), Guilhem Lavaux (1998); | |
9 | // Vadim Zeitlin (1999-2002) | |
10 | // Licence: wxWindows licence | |
11 | ///////////////////////////////////////////////////////////////////////////// | |
12 | ||
13 | #ifdef __GNUG__ | |
14 | #pragma implementation "thread.h" | |
15 | #endif | |
16 | ||
17 | // ---------------------------------------------------------------------------- | |
18 | // headers | |
19 | // ---------------------------------------------------------------------------- | |
20 | ||
21 | // For compilers that support precompilation, includes "wx.h". | |
22 | #include "wx/wxprec.h" | |
23 | ||
24 | #if defined(__BORLANDC__) | |
25 | #pragma hdrstop | |
26 | #endif | |
27 | ||
28 | #ifndef WX_PRECOMP | |
29 | # include "wx/wx.h" | |
30 | #endif | |
31 | ||
32 | #if wxUSE_THREADS | |
33 | ||
34 | #include "wx/msw/private.h" | |
35 | ||
36 | #include "wx/module.h" | |
37 | #include "wx/thread.h" | |
38 | ||
39 | // must have this symbol defined to get _beginthread/_endthread declarations | |
40 | #ifndef _MT | |
41 | #define _MT | |
42 | #endif | |
43 | ||
44 | #if defined(__BORLANDC__) | |
45 | #if !defined(__MT__) | |
46 | // I can't set -tWM in the IDE (anyone?) so have to do this | |
47 | #define __MT__ | |
48 | #endif | |
49 | ||
50 | #if !defined(__MFC_COMPAT__) | |
51 | // Needed to know about _beginthreadex etc.. | |
52 | #define __MFC_COMPAT__ | |
53 | #endif | |
54 | #endif // BC++ | |
55 | ||
56 | // define wxUSE_BEGIN_THREAD if the compiler has _beginthreadex() function | |
57 | // which should be used instead of Win32 ::CreateThread() if possible | |
58 | #if defined(__VISUALC__) || \ | |
59 | (defined(__BORLANDC__) && (__BORLANDC__ >= 0x500)) || \ | |
60 | (defined(__GNUG__) && defined(__MSVCRT__)) || \ | |
61 | defined(__WATCOMC__) || defined(__MWERKS__) | |
62 | ||
63 | #undef wxUSE_BEGIN_THREAD | |
64 | #define wxUSE_BEGIN_THREAD | |
65 | #endif | |
66 | ||
67 | #ifdef wxUSE_BEGIN_THREAD | |
68 | // this is where _beginthreadex() is declared | |
69 | #include <process.h> | |
70 | ||
71 | // the return type of the thread function entry point | |
72 | typedef unsigned THREAD_RETVAL; | |
73 | ||
74 | // the calling convention of the thread function entry point | |
75 | #define THREAD_CALLCONV __stdcall | |
76 | #else | |
77 | // the settings for CreateThread() | |
78 | typedef DWORD THREAD_RETVAL; | |
79 | #define THREAD_CALLCONV WINAPI | |
80 | #endif | |
81 | ||
82 | // ---------------------------------------------------------------------------- | |
83 | // constants | |
84 | // ---------------------------------------------------------------------------- | |
85 | ||
86 | // the possible states of the thread ("=>" shows all possible transitions from | |
87 | // this state) | |
88 | enum wxThreadState | |
89 | { | |
90 | STATE_NEW, // didn't start execution yet (=> RUNNING) | |
91 | STATE_RUNNING, // thread is running (=> PAUSED, CANCELED) | |
92 | STATE_PAUSED, // thread is temporarily suspended (=> RUNNING) | |
93 | STATE_CANCELED, // thread should terminate a.s.a.p. (=> EXITED) | |
94 | STATE_EXITED // thread is terminating | |
95 | }; | |
96 | ||
97 | // ---------------------------------------------------------------------------- | |
98 | // this module globals | |
99 | // ---------------------------------------------------------------------------- | |
100 | ||
101 | // TLS index of the slot where we store the pointer to the current thread | |
102 | static DWORD gs_tlsThisThread = 0xFFFFFFFF; | |
103 | ||
104 | // id of the main thread - the one which can call GUI functions without first | |
105 | // calling wxMutexGuiEnter() | |
106 | static DWORD gs_idMainThread = 0; | |
107 | ||
108 | // if it's FALSE, some secondary thread is holding the GUI lock | |
109 | static bool gs_bGuiOwnedByMainThread = TRUE; | |
110 | ||
111 | // critical section which controls access to all GUI functions: any secondary | |
112 | // thread (i.e. except the main one) must enter this crit section before doing | |
113 | // any GUI calls | |
114 | static wxCriticalSection *gs_critsectGui = NULL; | |
115 | ||
116 | // critical section which protects gs_nWaitingForGui variable | |
117 | static wxCriticalSection *gs_critsectWaitingForGui = NULL; | |
118 | ||
119 | // number of threads waiting for GUI in wxMutexGuiEnter() | |
120 | static size_t gs_nWaitingForGui = 0; | |
121 | ||
122 | // are we waiting for a thread termination? | |
123 | static bool gs_waitingForThread = FALSE; | |
124 | ||
125 | // ============================================================================ | |
126 | // Windows implementation of thread and related classes | |
127 | // ============================================================================ | |
128 | ||
129 | // ---------------------------------------------------------------------------- | |
130 | // wxCriticalSection | |
131 | // ---------------------------------------------------------------------------- | |
132 | ||
133 | wxCriticalSection::wxCriticalSection() | |
134 | { | |
135 | wxCOMPILE_TIME_ASSERT( sizeof(CRITICAL_SECTION) <= sizeof(m_buffer), | |
136 | wxCriticalSectionBufferTooSmall ); | |
137 | ||
138 | ::InitializeCriticalSection((CRITICAL_SECTION *)m_buffer); | |
139 | } | |
140 | ||
141 | wxCriticalSection::~wxCriticalSection() | |
142 | { | |
143 | ::DeleteCriticalSection((CRITICAL_SECTION *)m_buffer); | |
144 | } | |
145 | ||
146 | void wxCriticalSection::Enter() | |
147 | { | |
148 | ::EnterCriticalSection((CRITICAL_SECTION *)m_buffer); | |
149 | } | |
150 | ||
151 | void wxCriticalSection::Leave() | |
152 | { | |
153 | ::LeaveCriticalSection((CRITICAL_SECTION *)m_buffer); | |
154 | } | |
155 | ||
156 | // ---------------------------------------------------------------------------- | |
157 | // wxMutex | |
158 | // ---------------------------------------------------------------------------- | |
159 | ||
160 | class wxMutexInternal | |
161 | { | |
162 | public: | |
163 | wxMutexInternal(wxMutexType mutexType); | |
164 | ~wxMutexInternal(); | |
165 | ||
166 | bool IsOk() const { return m_mutex != NULL; } | |
167 | ||
168 | wxMutexError Lock() { return LockTimeout(INFINITE); } | |
169 | wxMutexError TryLock() { return LockTimeout(0); } | |
170 | wxMutexError Unlock(); | |
171 | ||
172 | private: | |
173 | wxMutexError LockTimeout(DWORD milliseconds); | |
174 | ||
175 | HANDLE m_mutex; | |
176 | }; | |
177 | ||
178 | // all mutexes are recursive under Win32 so we don't use mutexType | |
179 | wxMutexInternal::wxMutexInternal(wxMutexType WXUNUSED(mutexType)) | |
180 | { | |
181 | // create a nameless (hence intra process and always private) mutex | |
182 | m_mutex = ::CreateMutex | |
183 | ( | |
184 | NULL, // default secutiry attributes | |
185 | FALSE, // not initially locked | |
186 | NULL // no name | |
187 | ); | |
188 | ||
189 | if ( !m_mutex ) | |
190 | { | |
191 | wxLogLastError(_T("CreateMutex()")); | |
192 | } | |
193 | } | |
194 | ||
195 | wxMutexInternal::~wxMutexInternal() | |
196 | { | |
197 | if ( m_mutex ) | |
198 | { | |
199 | if ( !::CloseHandle(m_mutex) ) | |
200 | { | |
201 | wxLogLastError(_T("CloseHandle(mutex)")); | |
202 | } | |
203 | } | |
204 | } | |
205 | ||
206 | wxMutexError wxMutexInternal::LockTimeout(DWORD milliseconds) | |
207 | { | |
208 | DWORD rc = ::WaitForSingleObject(m_mutex, milliseconds); | |
209 | if ( rc == WAIT_ABANDONED ) | |
210 | { | |
211 | // the previous caller died without releasing the mutex, but now we can | |
212 | // really lock it | |
213 | wxLogDebug(_T("WaitForSingleObject() returned WAIT_ABANDONED")); | |
214 | ||
215 | // use 0 timeout, normally we should always get it | |
216 | rc = ::WaitForSingleObject(m_mutex, 0); | |
217 | } | |
218 | ||
219 | switch ( rc ) | |
220 | { | |
221 | case WAIT_OBJECT_0: | |
222 | // ok | |
223 | break; | |
224 | ||
225 | case WAIT_TIMEOUT: | |
226 | return wxMUTEX_BUSY; | |
227 | ||
228 | case WAIT_ABANDONED: // checked for above | |
229 | default: | |
230 | wxFAIL_MSG(wxT("impossible return value in wxMutex::Lock")); | |
231 | // fall through | |
232 | ||
233 | case WAIT_FAILED: | |
234 | wxLogLastError(_T("WaitForSingleObject(mutex)")); | |
235 | return wxMUTEX_MISC_ERROR; | |
236 | } | |
237 | ||
238 | return wxMUTEX_NO_ERROR; | |
239 | } | |
240 | ||
241 | wxMutexError wxMutexInternal::Unlock() | |
242 | { | |
243 | if ( !::ReleaseMutex(m_mutex) ) | |
244 | { | |
245 | wxLogLastError(_("ReleaseMutex()")); | |
246 | ||
247 | return wxMUTEX_MISC_ERROR; | |
248 | } | |
249 | ||
250 | return wxMUTEX_NO_ERROR; | |
251 | } | |
252 | ||
253 | // -------------------------------------------------------------------------- | |
254 | // wxSemaphore | |
255 | // -------------------------------------------------------------------------- | |
256 | ||
257 | // a trivial wrapper around Win32 semaphore | |
258 | class wxSemaphoreInternal | |
259 | { | |
260 | public: | |
261 | wxSemaphoreInternal(int initialcount, int maxcount); | |
262 | ~wxSemaphoreInternal(); | |
263 | ||
264 | bool IsOk() const { return m_semaphore != NULL; } | |
265 | ||
266 | wxSemaError Wait() { return WaitTimeout(INFINITE); } | |
267 | wxSemaError TryWait() { return WaitTimeout(0); } | |
268 | wxSemaError WaitTimeout(unsigned long milliseconds); | |
269 | ||
270 | wxSemaError Post(); | |
271 | ||
272 | private: | |
273 | HANDLE m_semaphore; | |
274 | }; | |
275 | ||
276 | wxSemaphoreInternal::wxSemaphoreInternal(int initialcount, int maxcount) | |
277 | { | |
278 | if ( maxcount == 0 ) | |
279 | { | |
280 | // make it practically infinite | |
281 | maxcount = INT_MAX; | |
282 | } | |
283 | ||
284 | m_semaphore = ::CreateSemaphore | |
285 | ( | |
286 | NULL, // default security attributes | |
287 | initialcount, | |
288 | maxcount, | |
289 | NULL // no name | |
290 | ); | |
291 | ||
292 | if ( !m_semaphore ) | |
293 | { | |
294 | wxLogLastError(_T("CreateSemaphore()")); | |
295 | } | |
296 | } | |
297 | ||
298 | wxSemaphoreInternal::~wxSemaphoreInternal() | |
299 | { | |
300 | if ( m_semaphore ) | |
301 | { | |
302 | if ( !::CloseHandle(m_semaphore) ) | |
303 | { | |
304 | wxLogLastError(_T("CloseHandle(semaphore)")); | |
305 | } | |
306 | } | |
307 | } | |
308 | ||
309 | wxSemaError wxSemaphoreInternal::WaitTimeout(unsigned long milliseconds) | |
310 | { | |
311 | DWORD rc = ::WaitForSingleObject( m_semaphore, milliseconds ); | |
312 | ||
313 | switch ( rc ) | |
314 | { | |
315 | case WAIT_OBJECT_0: | |
316 | return wxSEMA_NO_ERROR; | |
317 | ||
318 | case WAIT_TIMEOUT: | |
319 | return wxSEMA_BUSY; | |
320 | ||
321 | default: | |
322 | wxLogLastError(_T("WaitForSingleObject(semaphore)")); | |
323 | } | |
324 | ||
325 | return wxSEMA_MISC_ERROR; | |
326 | } | |
327 | ||
328 | wxSemaError wxSemaphoreInternal::Post() | |
329 | { | |
330 | if ( !::ReleaseSemaphore(m_semaphore, 1, NULL /* ptr to previous count */) ) | |
331 | { | |
332 | wxLogLastError(_T("ReleaseSemaphore")); | |
333 | ||
334 | return wxSEMA_MISC_ERROR; | |
335 | } | |
336 | ||
337 | return wxSEMA_NO_ERROR; | |
338 | } | |
339 | ||
340 | // -------------------------------------------------------------------------- | |
341 | // wxCondition | |
342 | // -------------------------------------------------------------------------- | |
343 | ||
344 | // Win32 doesn't have explicit support for the POSIX condition variables and | |
345 | // the Win32 events have quite different semantics, so we reimplement the | |
346 | // conditions from scratch using the mutexes and semaphores | |
347 | class wxConditionInternal | |
348 | { | |
349 | public: | |
350 | wxConditionInternal(wxMutex& mutex); | |
351 | ||
352 | bool IsOk() const { return m_mutex.IsOk() && m_semaphore.IsOk(); } | |
353 | ||
354 | wxCondError Wait(); | |
355 | wxCondError WaitTimeout(unsigned long milliseconds); | |
356 | ||
357 | wxCondError Signal(); | |
358 | wxCondError Broadcast(); | |
359 | ||
360 | private: | |
361 | // the number of threads currently waiting for this condition | |
362 | LONG m_numWaiters; | |
363 | ||
364 | // the critical section protecting m_numWaiters | |
365 | wxCriticalSection m_csWaiters; | |
366 | ||
367 | wxMutex& m_mutex; | |
368 | wxSemaphore m_semaphore; | |
369 | }; | |
370 | ||
371 | wxConditionInternal::wxConditionInternal(wxMutex& mutex) | |
372 | : m_mutex(mutex) | |
373 | { | |
374 | // another thread can't access it until we return from ctor, so no need to | |
375 | // protect access to m_numWaiters here | |
376 | m_numWaiters = 0; | |
377 | } | |
378 | ||
379 | wxCondError wxConditionInternal::Wait() | |
380 | { | |
381 | // increment the number of waiters | |
382 | ::InterlockedIncrement(&m_numWaiters); | |
383 | ||
384 | m_mutex.Unlock(); | |
385 | ||
386 | // a potential race condition can occur here | |
387 | // | |
388 | // after a thread increments nwaiters, and unlocks the mutex and before the | |
389 | // semaphore.Wait() is called, if another thread can cause a signal to be | |
390 | // generated | |
391 | // | |
392 | // this race condition is handled by using a semaphore and incrementing the | |
393 | // semaphore only if 'nwaiters' is greater that zero since the semaphore, | |
394 | // can 'remember' signals the race condition will not occur | |
395 | ||
396 | // wait ( if necessary ) and decrement semaphore | |
397 | wxSemaError err = m_semaphore.Wait(); | |
398 | m_mutex.Lock(); | |
399 | ||
400 | return err == wxSEMA_NO_ERROR ? wxCOND_NO_ERROR : wxCOND_MISC_ERROR; | |
401 | } | |
402 | ||
403 | wxCondError wxConditionInternal::WaitTimeout(unsigned long milliseconds) | |
404 | { | |
405 | ::InterlockedIncrement(&m_numWaiters); | |
406 | ||
407 | m_mutex.Unlock(); | |
408 | ||
409 | // a race condition can occur at this point in the code | |
410 | // | |
411 | // please see the comments in Wait(), for details | |
412 | ||
413 | wxSemaError err = m_semaphore.WaitTimeout(milliseconds); | |
414 | ||
415 | if ( err == wxSEMA_BUSY ) | |
416 | { | |
417 | // another potential race condition exists here it is caused when a | |
418 | // 'waiting' thread timesout, and returns from WaitForSingleObject, but | |
419 | // has not yet decremented 'nwaiters'. | |
420 | // | |
421 | // at this point if another thread calls signal() then the semaphore | |
422 | // will be incremented, but the waiting thread will miss it. | |
423 | // | |
424 | // to handle this particular case, the waiting thread calls | |
425 | // WaitForSingleObject again with a timeout of 0, after locking | |
426 | // 'nwaiters_mutex'. this call does not block because of the zero | |
427 | // timeout, but will allow the waiting thread to catch the missed | |
428 | // signals. | |
429 | wxCriticalSectionLocker lock(m_csWaiters); | |
430 | ||
431 | err = m_semaphore.WaitTimeout(0); | |
432 | ||
433 | if ( err != wxSEMA_NO_ERROR ) | |
434 | { | |
435 | m_numWaiters--; | |
436 | } | |
437 | } | |
438 | ||
439 | m_mutex.Lock(); | |
440 | ||
441 | return err == wxSEMA_NO_ERROR ? wxCOND_NO_ERROR : wxCOND_MISC_ERROR; | |
442 | } | |
443 | ||
444 | wxCondError wxConditionInternal::Signal() | |
445 | { | |
446 | wxCriticalSectionLocker lock(m_csWaiters); | |
447 | ||
448 | if ( m_numWaiters > 0 ) | |
449 | { | |
450 | // increment the semaphore by 1 | |
451 | if ( m_semaphore.Post() != wxSEMA_NO_ERROR ) | |
452 | return wxCOND_MISC_ERROR; | |
453 | ||
454 | m_numWaiters--; | |
455 | } | |
456 | ||
457 | return wxCOND_NO_ERROR; | |
458 | } | |
459 | ||
460 | wxCondError wxConditionInternal::Broadcast() | |
461 | { | |
462 | wxCriticalSectionLocker lock(m_csWaiters); | |
463 | ||
464 | while ( m_numWaiters > 0 ) | |
465 | { | |
466 | if ( m_semaphore.Post() != wxSEMA_NO_ERROR ) | |
467 | return wxCOND_MISC_ERROR; | |
468 | ||
469 | m_numWaiters--; | |
470 | } | |
471 | ||
472 | return wxCOND_NO_ERROR; | |
473 | } | |
474 | ||
475 | // ---------------------------------------------------------------------------- | |
476 | // wxThread implementation | |
477 | // ---------------------------------------------------------------------------- | |
478 | ||
479 | // wxThreadInternal class | |
480 | // ---------------------- | |
481 | ||
482 | class wxThreadInternal | |
483 | { | |
484 | public: | |
485 | wxThreadInternal() | |
486 | { | |
487 | m_hThread = 0; | |
488 | m_state = STATE_NEW; | |
489 | m_priority = WXTHREAD_DEFAULT_PRIORITY; | |
490 | } | |
491 | ||
492 | ~wxThreadInternal() | |
493 | { | |
494 | Free(); | |
495 | } | |
496 | ||
497 | void Free() | |
498 | { | |
499 | if ( m_hThread ) | |
500 | { | |
501 | if ( !::CloseHandle(m_hThread) ) | |
502 | { | |
503 | wxLogLastError(wxT("CloseHandle(thread)")); | |
504 | } | |
505 | ||
506 | m_hThread = 0; | |
507 | } | |
508 | } | |
509 | ||
510 | // create a new (suspended) thread (for the given thread object) | |
511 | bool Create(wxThread *thread, unsigned int stackSize); | |
512 | ||
513 | // suspend/resume/terminate | |
514 | bool Suspend(); | |
515 | bool Resume(); | |
516 | void Cancel() { m_state = STATE_CANCELED; } | |
517 | ||
518 | // thread state | |
519 | void SetState(wxThreadState state) { m_state = state; } | |
520 | wxThreadState GetState() const { return m_state; } | |
521 | ||
522 | // thread priority | |
523 | void SetPriority(unsigned int priority); | |
524 | unsigned int GetPriority() const { return m_priority; } | |
525 | ||
526 | // thread handle and id | |
527 | HANDLE GetHandle() const { return m_hThread; } | |
528 | DWORD GetId() const { return m_tid; } | |
529 | ||
530 | // thread function | |
531 | static THREAD_RETVAL THREAD_CALLCONV WinThreadStart(void *thread); | |
532 | ||
533 | private: | |
534 | HANDLE m_hThread; // handle of the thread | |
535 | wxThreadState m_state; // state, see wxThreadState enum | |
536 | unsigned int m_priority; // thread priority in "wx" units | |
537 | DWORD m_tid; // thread id | |
538 | }; | |
539 | ||
540 | THREAD_RETVAL THREAD_CALLCONV wxThreadInternal::WinThreadStart(void *param) | |
541 | { | |
542 | THREAD_RETVAL rc; | |
543 | bool wasCancelled; | |
544 | ||
545 | // first of all, check whether we hadn't been cancelled already and don't | |
546 | // start the user code at all then | |
547 | wxThread *thread = (wxThread *)param; | |
548 | if ( thread->m_internal->GetState() == STATE_EXITED ) | |
549 | { | |
550 | rc = (THREAD_RETVAL)-1; | |
551 | wasCancelled = TRUE; | |
552 | } | |
553 | else // do run thread | |
554 | { | |
555 | // store the thread object in the TLS | |
556 | if ( !::TlsSetValue(gs_tlsThisThread, thread) ) | |
557 | { | |
558 | wxLogSysError(_("Can not start thread: error writing TLS.")); | |
559 | ||
560 | return (DWORD)-1; | |
561 | } | |
562 | ||
563 | rc = (THREAD_RETVAL)thread->Entry(); | |
564 | ||
565 | // enter m_critsect before changing the thread state | |
566 | thread->m_critsect.Enter(); | |
567 | wasCancelled = thread->m_internal->GetState() == STATE_CANCELED; | |
568 | thread->m_internal->SetState(STATE_EXITED); | |
569 | thread->m_critsect.Leave(); | |
570 | } | |
571 | ||
572 | thread->OnExit(); | |
573 | ||
574 | // if the thread was cancelled (from Delete()), then its handle is still | |
575 | // needed there | |
576 | if ( thread->IsDetached() && !wasCancelled ) | |
577 | { | |
578 | // auto delete | |
579 | delete thread; | |
580 | } | |
581 | //else: the joinable threads handle will be closed when Wait() is done | |
582 | ||
583 | return rc; | |
584 | } | |
585 | ||
586 | void wxThreadInternal::SetPriority(unsigned int priority) | |
587 | { | |
588 | m_priority = priority; | |
589 | ||
590 | // translate wxWindows priority to the Windows one | |
591 | int win_priority; | |
592 | if (m_priority <= 20) | |
593 | win_priority = THREAD_PRIORITY_LOWEST; | |
594 | else if (m_priority <= 40) | |
595 | win_priority = THREAD_PRIORITY_BELOW_NORMAL; | |
596 | else if (m_priority <= 60) | |
597 | win_priority = THREAD_PRIORITY_NORMAL; | |
598 | else if (m_priority <= 80) | |
599 | win_priority = THREAD_PRIORITY_ABOVE_NORMAL; | |
600 | else if (m_priority <= 100) | |
601 | win_priority = THREAD_PRIORITY_HIGHEST; | |
602 | else | |
603 | { | |
604 | wxFAIL_MSG(wxT("invalid value of thread priority parameter")); | |
605 | win_priority = THREAD_PRIORITY_NORMAL; | |
606 | } | |
607 | ||
608 | if ( !::SetThreadPriority(m_hThread, win_priority) ) | |
609 | { | |
610 | wxLogSysError(_("Can't set thread priority")); | |
611 | } | |
612 | } | |
613 | ||
614 | bool wxThreadInternal::Create(wxThread *thread, unsigned int stackSize) | |
615 | { | |
616 | // for compilers which have it, we should use C RTL function for thread | |
617 | // creation instead of Win32 API one because otherwise we will have memory | |
618 | // leaks if the thread uses C RTL (and most threads do) | |
619 | #ifdef wxUSE_BEGIN_THREAD | |
620 | ||
621 | // Watcom is reported to not like 0 stack size (which means "use default" | |
622 | // for the other compilers and is also the default value for stackSize) | |
623 | #ifdef __WATCOMC__ | |
624 | if ( !stackSize ) | |
625 | stackSize = 10240; | |
626 | #endif // __WATCOMC__ | |
627 | ||
628 | m_hThread = (HANDLE)_beginthreadex | |
629 | ( | |
630 | NULL, // default security | |
631 | stackSize, | |
632 | wxThreadInternal::WinThreadStart, // entry point | |
633 | thread, | |
634 | CREATE_SUSPENDED, | |
635 | (unsigned int *)&m_tid | |
636 | ); | |
637 | #else // compiler doesn't have _beginthreadex | |
638 | m_hThread = ::CreateThread | |
639 | ( | |
640 | NULL, // default security | |
641 | stackSize, // stack size | |
642 | wxThreadInternal::WinThreadStart, // thread entry point | |
643 | (LPVOID)thread, // parameter | |
644 | CREATE_SUSPENDED, // flags | |
645 | &m_tid // [out] thread id | |
646 | ); | |
647 | #endif // _beginthreadex/CreateThread | |
648 | ||
649 | if ( m_hThread == NULL ) | |
650 | { | |
651 | wxLogSysError(_("Can't create thread")); | |
652 | ||
653 | return FALSE; | |
654 | } | |
655 | ||
656 | if ( m_priority != WXTHREAD_DEFAULT_PRIORITY ) | |
657 | { | |
658 | SetPriority(m_priority); | |
659 | } | |
660 | ||
661 | return TRUE; | |
662 | } | |
663 | ||
664 | bool wxThreadInternal::Suspend() | |
665 | { | |
666 | DWORD nSuspendCount = ::SuspendThread(m_hThread); | |
667 | if ( nSuspendCount == (DWORD)-1 ) | |
668 | { | |
669 | wxLogSysError(_("Can not suspend thread %x"), m_hThread); | |
670 | ||
671 | return FALSE; | |
672 | } | |
673 | ||
674 | m_state = STATE_PAUSED; | |
675 | ||
676 | return TRUE; | |
677 | } | |
678 | ||
679 | bool wxThreadInternal::Resume() | |
680 | { | |
681 | DWORD nSuspendCount = ::ResumeThread(m_hThread); | |
682 | if ( nSuspendCount == (DWORD)-1 ) | |
683 | { | |
684 | wxLogSysError(_("Can not resume thread %x"), m_hThread); | |
685 | ||
686 | return FALSE; | |
687 | } | |
688 | ||
689 | // don't change the state from STATE_EXITED because it's special and means | |
690 | // we are going to terminate without running any user code - if we did it, | |
691 | // the codei n Delete() wouldn't work | |
692 | if ( m_state != STATE_EXITED ) | |
693 | { | |
694 | m_state = STATE_RUNNING; | |
695 | } | |
696 | ||
697 | return TRUE; | |
698 | } | |
699 | ||
700 | // static functions | |
701 | // ---------------- | |
702 | ||
703 | wxThread *wxThread::This() | |
704 | { | |
705 | wxThread *thread = (wxThread *)::TlsGetValue(gs_tlsThisThread); | |
706 | ||
707 | // be careful, 0 may be a valid return value as well | |
708 | if ( !thread && (::GetLastError() != NO_ERROR) ) | |
709 | { | |
710 | wxLogSysError(_("Couldn't get the current thread pointer")); | |
711 | ||
712 | // return NULL... | |
713 | } | |
714 | ||
715 | return thread; | |
716 | } | |
717 | ||
718 | bool wxThread::IsMain() | |
719 | { | |
720 | return ::GetCurrentThreadId() == gs_idMainThread; | |
721 | } | |
722 | ||
723 | #ifdef Yield | |
724 | #undef Yield | |
725 | #endif | |
726 | ||
727 | void wxThread::Yield() | |
728 | { | |
729 | // 0 argument to Sleep() is special and means to just give away the rest of | |
730 | // our timeslice | |
731 | ::Sleep(0); | |
732 | } | |
733 | ||
734 | void wxThread::Sleep(unsigned long milliseconds) | |
735 | { | |
736 | ::Sleep(milliseconds); | |
737 | } | |
738 | ||
739 | int wxThread::GetCPUCount() | |
740 | { | |
741 | SYSTEM_INFO si; | |
742 | GetSystemInfo(&si); | |
743 | ||
744 | return si.dwNumberOfProcessors; | |
745 | } | |
746 | ||
747 | unsigned long wxThread::GetCurrentId() | |
748 | { | |
749 | return (unsigned long)::GetCurrentThreadId(); | |
750 | } | |
751 | ||
752 | bool wxThread::SetConcurrency(size_t level) | |
753 | { | |
754 | wxASSERT_MSG( IsMain(), _T("should only be called from the main thread") ); | |
755 | ||
756 | // ok only for the default one | |
757 | if ( level == 0 ) | |
758 | return 0; | |
759 | ||
760 | // get system affinity mask first | |
761 | HANDLE hProcess = ::GetCurrentProcess(); | |
762 | DWORD dwProcMask, dwSysMask; | |
763 | if ( ::GetProcessAffinityMask(hProcess, &dwProcMask, &dwSysMask) == 0 ) | |
764 | { | |
765 | wxLogLastError(_T("GetProcessAffinityMask")); | |
766 | ||
767 | return FALSE; | |
768 | } | |
769 | ||
770 | // how many CPUs have we got? | |
771 | if ( dwSysMask == 1 ) | |
772 | { | |
773 | // don't bother with all this complicated stuff - on a single | |
774 | // processor system it doesn't make much sense anyhow | |
775 | return level == 1; | |
776 | } | |
777 | ||
778 | // calculate the process mask: it's a bit vector with one bit per | |
779 | // processor; we want to schedule the process to run on first level | |
780 | // CPUs | |
781 | DWORD bit = 1; | |
782 | while ( bit ) | |
783 | { | |
784 | if ( dwSysMask & bit ) | |
785 | { | |
786 | // ok, we can set this bit | |
787 | dwProcMask |= bit; | |
788 | ||
789 | // another process added | |
790 | if ( !--level ) | |
791 | { | |
792 | // and that's enough | |
793 | break; | |
794 | } | |
795 | } | |
796 | ||
797 | // next bit | |
798 | bit <<= 1; | |
799 | } | |
800 | ||
801 | // could we set all bits? | |
802 | if ( level != 0 ) | |
803 | { | |
804 | wxLogDebug(_T("bad level %u in wxThread::SetConcurrency()"), level); | |
805 | ||
806 | return FALSE; | |
807 | } | |
808 | ||
809 | // set it: we can't link to SetProcessAffinityMask() because it doesn't | |
810 | // exist in Win9x, use RT binding instead | |
811 | ||
812 | typedef BOOL (*SETPROCESSAFFINITYMASK)(HANDLE, DWORD); | |
813 | ||
814 | // can use static var because we're always in the main thread here | |
815 | static SETPROCESSAFFINITYMASK pfnSetProcessAffinityMask = NULL; | |
816 | ||
817 | if ( !pfnSetProcessAffinityMask ) | |
818 | { | |
819 | HMODULE hModKernel = ::LoadLibrary(_T("kernel32")); | |
820 | if ( hModKernel ) | |
821 | { | |
822 | pfnSetProcessAffinityMask = (SETPROCESSAFFINITYMASK) | |
823 | ::GetProcAddress(hModKernel, "SetProcessAffinityMask"); | |
824 | } | |
825 | ||
826 | // we've discovered a MT version of Win9x! | |
827 | wxASSERT_MSG( pfnSetProcessAffinityMask, | |
828 | _T("this system has several CPUs but no SetProcessAffinityMask function?") ); | |
829 | } | |
830 | ||
831 | if ( !pfnSetProcessAffinityMask ) | |
832 | { | |
833 | // msg given above - do it only once | |
834 | return FALSE; | |
835 | } | |
836 | ||
837 | if ( pfnSetProcessAffinityMask(hProcess, dwProcMask) == 0 ) | |
838 | { | |
839 | wxLogLastError(_T("SetProcessAffinityMask")); | |
840 | ||
841 | return FALSE; | |
842 | } | |
843 | ||
844 | return TRUE; | |
845 | } | |
846 | ||
847 | // ctor and dtor | |
848 | // ------------- | |
849 | ||
850 | wxThread::wxThread(wxThreadKind kind) | |
851 | { | |
852 | m_internal = new wxThreadInternal(); | |
853 | ||
854 | m_isDetached = kind == wxTHREAD_DETACHED; | |
855 | } | |
856 | ||
857 | wxThread::~wxThread() | |
858 | { | |
859 | delete m_internal; | |
860 | } | |
861 | ||
862 | // create/start thread | |
863 | // ------------------- | |
864 | ||
865 | wxThreadError wxThread::Create(unsigned int stackSize) | |
866 | { | |
867 | wxCriticalSectionLocker lock(m_critsect); | |
868 | ||
869 | if ( !m_internal->Create(this, stackSize) ) | |
870 | return wxTHREAD_NO_RESOURCE; | |
871 | ||
872 | return wxTHREAD_NO_ERROR; | |
873 | } | |
874 | ||
875 | wxThreadError wxThread::Run() | |
876 | { | |
877 | wxCriticalSectionLocker lock(m_critsect); | |
878 | ||
879 | if ( m_internal->GetState() != STATE_NEW ) | |
880 | { | |
881 | // actually, it may be almost any state at all, not only STATE_RUNNING | |
882 | return wxTHREAD_RUNNING; | |
883 | } | |
884 | ||
885 | // the thread has just been created and is still suspended - let it run | |
886 | return Resume(); | |
887 | } | |
888 | ||
889 | // suspend/resume thread | |
890 | // --------------------- | |
891 | ||
892 | wxThreadError wxThread::Pause() | |
893 | { | |
894 | wxCriticalSectionLocker lock(m_critsect); | |
895 | ||
896 | return m_internal->Suspend() ? wxTHREAD_NO_ERROR : wxTHREAD_MISC_ERROR; | |
897 | } | |
898 | ||
899 | wxThreadError wxThread::Resume() | |
900 | { | |
901 | wxCriticalSectionLocker lock(m_critsect); | |
902 | ||
903 | return m_internal->Resume() ? wxTHREAD_NO_ERROR : wxTHREAD_MISC_ERROR; | |
904 | } | |
905 | ||
906 | // stopping thread | |
907 | // --------------- | |
908 | ||
909 | wxThread::ExitCode wxThread::Wait() | |
910 | { | |
911 | // although under Windows we can wait for any thread, it's an error to | |
912 | // wait for a detached one in wxWin API | |
913 | wxCHECK_MSG( !IsDetached(), (ExitCode)-1, | |
914 | _T("can't wait for detached thread") ); | |
915 | ||
916 | ExitCode rc = (ExitCode)-1; | |
917 | ||
918 | (void)Delete(&rc); | |
919 | ||
920 | m_internal->Free(); | |
921 | ||
922 | return rc; | |
923 | } | |
924 | ||
925 | wxThreadError wxThread::Delete(ExitCode *pRc) | |
926 | { | |
927 | ExitCode rc = 0; | |
928 | ||
929 | // Delete() is always safe to call, so consider all possible states | |
930 | ||
931 | // we might need to resume the thread, but we might also not need to cancel | |
932 | // it if it doesn't run yet | |
933 | bool shouldResume = FALSE, | |
934 | shouldCancel = TRUE, | |
935 | isRunning = FALSE; | |
936 | ||
937 | // check if the thread already started to run | |
938 | { | |
939 | wxCriticalSectionLocker lock(m_critsect); | |
940 | ||
941 | if ( m_internal->GetState() == STATE_NEW ) | |
942 | { | |
943 | // WinThreadStart() will see it and terminate immediately, no need | |
944 | // to cancel the thread - but we still need to resume it to let it | |
945 | // run | |
946 | m_internal->SetState(STATE_EXITED); | |
947 | ||
948 | Resume(); // it knows about STATE_EXITED special case | |
949 | ||
950 | shouldCancel = FALSE; | |
951 | isRunning = TRUE; | |
952 | ||
953 | // shouldResume is correctly set to FALSE here | |
954 | } | |
955 | else | |
956 | { | |
957 | shouldResume = IsPaused(); | |
958 | } | |
959 | } | |
960 | ||
961 | // resume the thread if it is paused | |
962 | if ( shouldResume ) | |
963 | Resume(); | |
964 | ||
965 | HANDLE hThread = m_internal->GetHandle(); | |
966 | ||
967 | // does is still run? | |
968 | if ( isRunning || IsRunning() ) | |
969 | { | |
970 | if ( IsMain() ) | |
971 | { | |
972 | // set flag for wxIsWaitingForThread() | |
973 | gs_waitingForThread = TRUE; | |
974 | ||
975 | #if wxUSE_GUI | |
976 | wxBeginBusyCursor(); | |
977 | #endif // wxUSE_GUI | |
978 | } | |
979 | ||
980 | // ask the thread to terminate | |
981 | if ( shouldCancel ) | |
982 | { | |
983 | wxCriticalSectionLocker lock(m_critsect); | |
984 | ||
985 | m_internal->Cancel(); | |
986 | } | |
987 | ||
988 | #if wxUSE_GUI | |
989 | // we can't just wait for the thread to terminate because it might be | |
990 | // calling some GUI functions and so it will never terminate before we | |
991 | // process the Windows messages that result from these functions | |
992 | DWORD result; | |
993 | do | |
994 | { | |
995 | result = ::MsgWaitForMultipleObjects | |
996 | ( | |
997 | 1, // number of objects to wait for | |
998 | &hThread, // the objects | |
999 | FALSE, // don't wait for all objects | |
1000 | INFINITE, // no timeout | |
1001 | QS_ALLEVENTS // return as soon as there are any events | |
1002 | ); | |
1003 | ||
1004 | switch ( result ) | |
1005 | { | |
1006 | case 0xFFFFFFFF: | |
1007 | // error | |
1008 | wxLogSysError(_("Can not wait for thread termination")); | |
1009 | Kill(); | |
1010 | return wxTHREAD_KILLED; | |
1011 | ||
1012 | case WAIT_OBJECT_0: | |
1013 | // thread we're waiting for terminated | |
1014 | break; | |
1015 | ||
1016 | case WAIT_OBJECT_0 + 1: | |
1017 | // new message arrived, process it | |
1018 | if ( !wxTheApp->DoMessage() ) | |
1019 | { | |
1020 | // WM_QUIT received: kill the thread | |
1021 | Kill(); | |
1022 | ||
1023 | return wxTHREAD_KILLED; | |
1024 | } | |
1025 | ||
1026 | if ( IsMain() ) | |
1027 | { | |
1028 | // give the thread we're waiting for chance to exit | |
1029 | // from the GUI call it might have been in | |
1030 | if ( (gs_nWaitingForGui > 0) && wxGuiOwnedByMainThread() ) | |
1031 | { | |
1032 | wxMutexGuiLeave(); | |
1033 | } | |
1034 | } | |
1035 | ||
1036 | break; | |
1037 | ||
1038 | default: | |
1039 | wxFAIL_MSG(wxT("unexpected result of MsgWaitForMultipleObject")); | |
1040 | } | |
1041 | } while ( result != WAIT_OBJECT_0 ); | |
1042 | #else // !wxUSE_GUI | |
1043 | // simply wait for the thread to terminate | |
1044 | // | |
1045 | // OTOH, even console apps create windows (in wxExecute, for WinSock | |
1046 | // &c), so may be use MsgWaitForMultipleObject() too here? | |
1047 | if ( WaitForSingleObject(hThread, INFINITE) != WAIT_OBJECT_0 ) | |
1048 | { | |
1049 | wxFAIL_MSG(wxT("unexpected result of WaitForSingleObject")); | |
1050 | } | |
1051 | #endif // wxUSE_GUI/!wxUSE_GUI | |
1052 | ||
1053 | if ( IsMain() ) | |
1054 | { | |
1055 | gs_waitingForThread = FALSE; | |
1056 | ||
1057 | #if wxUSE_GUI | |
1058 | wxEndBusyCursor(); | |
1059 | #endif // wxUSE_GUI | |
1060 | } | |
1061 | } | |
1062 | ||
1063 | // although the thread might be already in the EXITED state it might not | |
1064 | // have terminated yet and so we are not sure that it has actually | |
1065 | // terminated if the "if" above hadn't been taken | |
1066 | do | |
1067 | { | |
1068 | if ( !::GetExitCodeThread(hThread, (LPDWORD)&rc) ) | |
1069 | { | |
1070 | wxLogLastError(wxT("GetExitCodeThread")); | |
1071 | ||
1072 | rc = (ExitCode)-1; | |
1073 | } | |
1074 | } while ( (DWORD)rc == STILL_ACTIVE ); | |
1075 | ||
1076 | if ( IsDetached() ) | |
1077 | { | |
1078 | // if the thread exits normally, this is done in WinThreadStart, but in | |
1079 | // this case it would have been too early because | |
1080 | // MsgWaitForMultipleObject() would fail if the thread handle was | |
1081 | // closed while we were waiting on it, so we must do it here | |
1082 | delete this; | |
1083 | } | |
1084 | ||
1085 | if ( pRc ) | |
1086 | *pRc = rc; | |
1087 | ||
1088 | return rc == (ExitCode)-1 ? wxTHREAD_MISC_ERROR : wxTHREAD_NO_ERROR; | |
1089 | } | |
1090 | ||
1091 | wxThreadError wxThread::Kill() | |
1092 | { | |
1093 | if ( !IsRunning() ) | |
1094 | return wxTHREAD_NOT_RUNNING; | |
1095 | ||
1096 | if ( !::TerminateThread(m_internal->GetHandle(), (DWORD)-1) ) | |
1097 | { | |
1098 | wxLogSysError(_("Couldn't terminate thread")); | |
1099 | ||
1100 | return wxTHREAD_MISC_ERROR; | |
1101 | } | |
1102 | ||
1103 | m_internal->Free(); | |
1104 | ||
1105 | if ( IsDetached() ) | |
1106 | { | |
1107 | delete this; | |
1108 | } | |
1109 | ||
1110 | return wxTHREAD_NO_ERROR; | |
1111 | } | |
1112 | ||
1113 | void wxThread::Exit(ExitCode status) | |
1114 | { | |
1115 | m_internal->Free(); | |
1116 | ||
1117 | if ( IsDetached() ) | |
1118 | { | |
1119 | delete this; | |
1120 | } | |
1121 | ||
1122 | #ifdef wxUSE_BEGIN_THREAD | |
1123 | _endthreadex((unsigned)status); | |
1124 | #else // !VC++ | |
1125 | ::ExitThread((DWORD)status); | |
1126 | #endif // VC++/!VC++ | |
1127 | ||
1128 | wxFAIL_MSG(wxT("Couldn't return from ExitThread()!")); | |
1129 | } | |
1130 | ||
1131 | // priority setting | |
1132 | // ---------------- | |
1133 | ||
1134 | void wxThread::SetPriority(unsigned int prio) | |
1135 | { | |
1136 | wxCriticalSectionLocker lock(m_critsect); | |
1137 | ||
1138 | m_internal->SetPriority(prio); | |
1139 | } | |
1140 | ||
1141 | unsigned int wxThread::GetPriority() const | |
1142 | { | |
1143 | wxCriticalSectionLocker lock((wxCriticalSection &)m_critsect); // const_cast | |
1144 | ||
1145 | return m_internal->GetPriority(); | |
1146 | } | |
1147 | ||
1148 | unsigned long wxThread::GetId() const | |
1149 | { | |
1150 | wxCriticalSectionLocker lock((wxCriticalSection &)m_critsect); // const_cast | |
1151 | ||
1152 | return (unsigned long)m_internal->GetId(); | |
1153 | } | |
1154 | ||
1155 | bool wxThread::IsRunning() const | |
1156 | { | |
1157 | wxCriticalSectionLocker lock((wxCriticalSection &)m_critsect); // const_cast | |
1158 | ||
1159 | return m_internal->GetState() == STATE_RUNNING; | |
1160 | } | |
1161 | ||
1162 | bool wxThread::IsAlive() const | |
1163 | { | |
1164 | wxCriticalSectionLocker lock((wxCriticalSection &)m_critsect); // const_cast | |
1165 | ||
1166 | return (m_internal->GetState() == STATE_RUNNING) || | |
1167 | (m_internal->GetState() == STATE_PAUSED); | |
1168 | } | |
1169 | ||
1170 | bool wxThread::IsPaused() const | |
1171 | { | |
1172 | wxCriticalSectionLocker lock((wxCriticalSection &)m_critsect); // const_cast | |
1173 | ||
1174 | return m_internal->GetState() == STATE_PAUSED; | |
1175 | } | |
1176 | ||
1177 | bool wxThread::TestDestroy() | |
1178 | { | |
1179 | wxCriticalSectionLocker lock((wxCriticalSection &)m_critsect); // const_cast | |
1180 | ||
1181 | return m_internal->GetState() == STATE_CANCELED; | |
1182 | } | |
1183 | ||
1184 | // ---------------------------------------------------------------------------- | |
1185 | // Automatic initialization for thread module | |
1186 | // ---------------------------------------------------------------------------- | |
1187 | ||
1188 | class wxThreadModule : public wxModule | |
1189 | { | |
1190 | public: | |
1191 | virtual bool OnInit(); | |
1192 | virtual void OnExit(); | |
1193 | ||
1194 | private: | |
1195 | DECLARE_DYNAMIC_CLASS(wxThreadModule) | |
1196 | }; | |
1197 | ||
1198 | IMPLEMENT_DYNAMIC_CLASS(wxThreadModule, wxModule) | |
1199 | ||
1200 | bool wxThreadModule::OnInit() | |
1201 | { | |
1202 | // allocate TLS index for storing the pointer to the current thread | |
1203 | gs_tlsThisThread = ::TlsAlloc(); | |
1204 | if ( gs_tlsThisThread == 0xFFFFFFFF ) | |
1205 | { | |
1206 | // in normal circumstances it will only happen if all other | |
1207 | // TLS_MINIMUM_AVAILABLE (>= 64) indices are already taken - in other | |
1208 | // words, this should never happen | |
1209 | wxLogSysError(_("Thread module initialization failed: impossible to allocate index in thread local storage")); | |
1210 | ||
1211 | return FALSE; | |
1212 | } | |
1213 | ||
1214 | // main thread doesn't have associated wxThread object, so store 0 in the | |
1215 | // TLS instead | |
1216 | if ( !::TlsSetValue(gs_tlsThisThread, (LPVOID)0) ) | |
1217 | { | |
1218 | ::TlsFree(gs_tlsThisThread); | |
1219 | gs_tlsThisThread = 0xFFFFFFFF; | |
1220 | ||
1221 | wxLogSysError(_("Thread module initialization failed: can not store value in thread local storage")); | |
1222 | ||
1223 | return FALSE; | |
1224 | } | |
1225 | ||
1226 | gs_critsectWaitingForGui = new wxCriticalSection(); | |
1227 | ||
1228 | gs_critsectGui = new wxCriticalSection(); | |
1229 | gs_critsectGui->Enter(); | |
1230 | ||
1231 | // no error return for GetCurrentThreadId() | |
1232 | gs_idMainThread = ::GetCurrentThreadId(); | |
1233 | ||
1234 | return TRUE; | |
1235 | } | |
1236 | ||
1237 | void wxThreadModule::OnExit() | |
1238 | { | |
1239 | if ( !::TlsFree(gs_tlsThisThread) ) | |
1240 | { | |
1241 | wxLogLastError(wxT("TlsFree failed.")); | |
1242 | } | |
1243 | ||
1244 | if ( gs_critsectGui ) | |
1245 | { | |
1246 | gs_critsectGui->Leave(); | |
1247 | delete gs_critsectGui; | |
1248 | gs_critsectGui = NULL; | |
1249 | } | |
1250 | ||
1251 | delete gs_critsectWaitingForGui; | |
1252 | gs_critsectWaitingForGui = NULL; | |
1253 | } | |
1254 | ||
1255 | // ---------------------------------------------------------------------------- | |
1256 | // under Windows, these functions are implemented using a critical section and | |
1257 | // not a mutex, so the names are a bit confusing | |
1258 | // ---------------------------------------------------------------------------- | |
1259 | ||
1260 | void WXDLLEXPORT wxMutexGuiEnter() | |
1261 | { | |
1262 | // this would dead lock everything... | |
1263 | wxASSERT_MSG( !wxThread::IsMain(), | |
1264 | wxT("main thread doesn't want to block in wxMutexGuiEnter()!") ); | |
1265 | ||
1266 | // the order in which we enter the critical sections here is crucial!! | |
1267 | ||
1268 | // set the flag telling to the main thread that we want to do some GUI | |
1269 | { | |
1270 | wxCriticalSectionLocker enter(*gs_critsectWaitingForGui); | |
1271 | ||
1272 | gs_nWaitingForGui++; | |
1273 | } | |
1274 | ||
1275 | wxWakeUpMainThread(); | |
1276 | ||
1277 | // now we may block here because the main thread will soon let us in | |
1278 | // (during the next iteration of OnIdle()) | |
1279 | gs_critsectGui->Enter(); | |
1280 | } | |
1281 | ||
1282 | void WXDLLEXPORT wxMutexGuiLeave() | |
1283 | { | |
1284 | wxCriticalSectionLocker enter(*gs_critsectWaitingForGui); | |
1285 | ||
1286 | if ( wxThread::IsMain() ) | |
1287 | { | |
1288 | gs_bGuiOwnedByMainThread = FALSE; | |
1289 | } | |
1290 | else | |
1291 | { | |
1292 | // decrement the number of threads waiting for GUI access now | |
1293 | wxASSERT_MSG( gs_nWaitingForGui > 0, | |
1294 | wxT("calling wxMutexGuiLeave() without entering it first?") ); | |
1295 | ||
1296 | gs_nWaitingForGui--; | |
1297 | ||
1298 | wxWakeUpMainThread(); | |
1299 | } | |
1300 | ||
1301 | gs_critsectGui->Leave(); | |
1302 | } | |
1303 | ||
1304 | void WXDLLEXPORT wxMutexGuiLeaveOrEnter() | |
1305 | { | |
1306 | wxASSERT_MSG( wxThread::IsMain(), | |
1307 | wxT("only main thread may call wxMutexGuiLeaveOrEnter()!") ); | |
1308 | ||
1309 | wxCriticalSectionLocker enter(*gs_critsectWaitingForGui); | |
1310 | ||
1311 | if ( gs_nWaitingForGui == 0 ) | |
1312 | { | |
1313 | // no threads are waiting for GUI - so we may acquire the lock without | |
1314 | // any danger (but only if we don't already have it) | |
1315 | if ( !wxGuiOwnedByMainThread() ) | |
1316 | { | |
1317 | gs_critsectGui->Enter(); | |
1318 | ||
1319 | gs_bGuiOwnedByMainThread = TRUE; | |
1320 | } | |
1321 | //else: already have it, nothing to do | |
1322 | } | |
1323 | else | |
1324 | { | |
1325 | // some threads are waiting, release the GUI lock if we have it | |
1326 | if ( wxGuiOwnedByMainThread() ) | |
1327 | { | |
1328 | wxMutexGuiLeave(); | |
1329 | } | |
1330 | //else: some other worker thread is doing GUI | |
1331 | } | |
1332 | } | |
1333 | ||
1334 | bool WXDLLEXPORT wxGuiOwnedByMainThread() | |
1335 | { | |
1336 | return gs_bGuiOwnedByMainThread; | |
1337 | } | |
1338 | ||
1339 | // wake up the main thread if it's in ::GetMessage() | |
1340 | void WXDLLEXPORT wxWakeUpMainThread() | |
1341 | { | |
1342 | // sending any message would do - hopefully WM_NULL is harmless enough | |
1343 | if ( !::PostThreadMessage(gs_idMainThread, WM_NULL, 0, 0) ) | |
1344 | { | |
1345 | // should never happen | |
1346 | wxLogLastError(wxT("PostThreadMessage(WM_NULL)")); | |
1347 | } | |
1348 | } | |
1349 | ||
1350 | bool WXDLLEXPORT wxIsWaitingForThread() | |
1351 | { | |
1352 | return gs_waitingForThread; | |
1353 | } | |
1354 | ||
1355 | // ---------------------------------------------------------------------------- | |
1356 | // include common implementation code | |
1357 | // ---------------------------------------------------------------------------- | |
1358 | ||
1359 | #include "wx/thrimpl.cpp" | |
1360 | ||
1361 | #endif // wxUSE_THREADS | |
1362 |